There are lots of ways to sacrifice permanents in the Blood Rites deck, which can potentially turn Carmen into a terrifying monster
A set full of classic Magic charm, delightful throwback characters, and stunning special treatments
Counterspell (Ice Age/Alliances, Tempest/Stronghold/Exodus, Masques/Nemesis/Prophecy) Counterspells are decent in limited, but by no means the be-all, end-all of the universe
On top of this already intimidating list of mechanics, whenever Captain America attacks, other Heroes you control gain +X/+X until the end of the turn, where X is the value of Captain America's toughness
It needs less bodies to win with since you only need to deal 10 total damage to your opponent to kill them, and in multiplayer you just need 10 per person, very possible in one turn
Cox added that the company left demand on the table because it couldnt produce enough